JP2709333B2 - Chair - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a chair provided with a swinging mechanism for a seat plate and a backrest, which is useful mainly as a swivel chair for office use.

[Prior art] In recent years, a swing mechanism for a seat or a backrest that has little fatigue even if various postures are taken to improve the comfort of the office rotating chair, sit for a long time, or A number of ergonomic seats and backrest swing mechanisms have been proposed that can respond ergonomically in response to various posture changes during that time.Some of them have been put to practical use. I can see it.

[Problems to be solved by the invention]

Thus, most of the conventionally proposed seat and backrest swing mechanisms include a seat frame for supporting a chair seat,
The backrest support frame that supports the backrest is connected via a link mechanism, and the vertical swing of the seat (sinking operation) and the back-and-forth swing of the seat are linked in a fixed relationship. Things.

However, the conventionally proposed link mechanism for interlocking the swinging motion of the seat and the backrest is complicated in structure, and therefore, if an office chair using such a mechanism is to be actually manufactured, parts will be required. The number of points is extremely large, which not only increases manufacturing costs and component costs, but also requires a great deal of manufacturing effort, and the operation is not smooth and easy due to the complicated mechanism, and therefore, the seating posture is unnatural. Problems such as getting tired and getting tired rather have been pointed out.

In view of the above, the present invention has a structure with a small number of parts, thereby reducing manufacturing labor and cost, ensuring smooth and smooth operation, and having a seating posture and a feeling of seating which are conventionally proposed. It is an object of the present invention to develop a chair having a better interlocking mechanism of the seat and the backrest.

[Means for solving the problem]

The configuration of the present invention made for the purpose of solving the above-described problems includes a seat frame that supports a chair seat,
While dividing the seat back and forth with reference to the sitting reference point or the vicinity thereof, and connecting the rear end portion of the front seat frame and the front end portion of the rear seat frame via a horizontal connection shaft at this split portion. A rear end of the rear seat frame is formed integrally with the rear seat frame as a connecting portion that is raised substantially at a right angle to mount a lower end of the backrest supporting frame that supports the backrest. The front end side of the frame is formed so as to extend below the front seat frame side, and a buffer member such as a gas spring is erected between the extended end portion and the front seat frame. The rear end of the seat frame is attached to the leg support on a vertical axis passing through or near the sitting position reference point.

[Action]

The seat frame divided forward and backward near the sitting position reference point,
The rear seat frame swings up and down on a horizontal connecting shaft set near the dividing point, and a connecting portion of a backrest support frame to which a backrest mounting frame is coupled and integrated at the rear of the rear seat frame. Since it is formed integrally, the backrest and the swing center of the rear half of the seat can be positioned at a fixed position near the sitting reference point.

〔Example〕

 Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a side view showing an outline of an example of the mechanism of the present invention, and FIG.
FIG. 3 is a plan view, FIG. 3 is a perspective view showing the relationship between the front seat frame and the legs of the rear seat frame connected to the front seat frame, FIG. 4 is a perspective view showing the relationship between the seat member and its downer shell, and FIG. FIG. 6 is a perspective view showing the relationship between the backrest member and its mounting frame, and FIG. 6 is a side view of an example of an office swivel chair formed with the members shown in FIGS.

First, in FIGS. 1 and 2, reference numeral 1 denotes a bearing hole 2 for supporting a horizontal first shaft 10 (described later) which is disposed on the front end side along the width direction of the seat surface of the chair. And a main body 1a having a vertical mounting hole 3 supported on the upper end side of the leg support P of the swivel chair on the rear end side, is a front seat frame having a substantially rectangular planar shape and a substantially regular cross section. . The seat frame 1 is formed with wing-like portions 1b and 1c in which an intermediate portion of a main body 1a projects substantially horizontally to the left and right as viewed from a plane.
The wing portions 1b and 1c are provided on an upper surface of the front seat frame 1 as shown in FIGS.
It supports the front half side Sf of the sheet member S disposed via the first and second portions 22 and 22 and functions as a terminal mounting portion of the armrest member E.

Further, a bearing hole 4 for mounting a second shaft 11 (described later) parallel to the first shaft 10 is formed at the rear end of the main body 1a of the seat frame 1. The bearing hole 4 and the mounting hole 3 of the leg post P are provided close to each other, and the center of the mounting hole 3 is on or near a vertical axis passing through or near the sitting reference point Sp in the seat member S of the chair. Is formed so as to be located at

Reference numeral 5 denotes a rear seat frame. Here, the front ends of the left and right walls viewed from the front of the main body 5a formed to have substantially the same width as the front seat frame 1 are respectively extended slightly forward and downward. Parts 5b and 5c are formed, and short wing parts 5d and 5e are formed on the left and right sides of the upper surface of the side walls.

An intermediate portion of the rear seat frame 5 is bent and raised by approximately 90 degrees with a relatively large radius to stand up, and an upper half 6b for connecting and fixing a lower half 9a of a backrest support frame 9 described later. The lower half side 6a of the connecting portion 6 provided with is integrated with the frame 5. Actually, as shown in FIG. 3, the rear seat frame 5 and the connecting portion 6 are formed in advance by integral molding. It is optional whether they are formed integrally or separately and then integrated later.

On the other hand, the extension 5 provided in front of the rear seat frame 5
In b and 5c, a bearing hole 7 corresponding to the bearing hole 4 in the front seat frame 1 is formed at the rear end of the extension portions 5b and 5c, and the above-described end portion of the extension portions 5b and 5c is formed. A bearing hole 8 for mounting a third shaft 12 (described later) parallel to the first shaft 10 is formed.

Here, in FIG. 1, a backrest support frame 9 is attached to the upper end of the upper half 6b of the connecting portion 6 integral with the rear seat frame 5. Here, the frame 9 has elasticity by itself and is formed in a substantially rectangular shape having a shallow angle as viewed from the side.

The mounting frame 9 is actually formed so as to also serve as the outer shell 23 (see FIGS. 5 and 6) of the backrest member B, as shown in FIG.

Thus, the front end of the front seat frame 1 and the front end of the rear seat frame 5 are provided in the bearing holes 4 and 7 formed in the portion with or without a bearing. Axis 1
By mounting 1 as a connection shaft, both frames 1 and 5 are swingably connected around this horizontal shaft 11. Actually, since the front seat frame 1 has the rear mounting hole 3 fitted and supported by the leg support P and is integrated with the side of the leg L of the chair, the front seat frame 1 actually swings in the rear seat frame 5. Only on the side.

Seat frame 1 before and after assembling as described above
And 5 are horizontal shafts 10 and 12 in bearing holes 2 and 8 respectively formed.
Are mounted as a first shaft and a third shaft, and a cushioning member 13 of a coil spring or a gas spring is provided between the two shafts.

When the cushioning member 13 is a coil spring, the rear seat frame 5, and the connecting portion 6 and the backrest supporting frame 9 integrated with the frame 5 are secured to swing about the second shaft 11, and the swing is secured. Movement is damped by the spring.

On the other hand, when the cushioning member 13 is a gas spring, in addition to having substantially the same cushioning action as the spring due to gas compressibility,
By blocking the gas flow in the gas cylinder, the sink angle of the rear seat frame 5 and the inclination angle of the connecting portion 6 and the backrest mounting frame 9 integrated with the frame 5 can be locked at desired positions. I can do it. The coil spring and the gas spring described above may be used in combination.

The swing mechanism of the chair according to the present invention configured as described above, the seat member S is mounted on the upper surface of the seat frames 1 and 5 divided forward and backward near the sitting position reference point Sp and connected by the second shaft 11. The front and rear seat frames 1 and 5 are mounted separately or in front of or behind the frames 1,5.
The outer shells 21 and 2 for a seat frame which are integrally formed and cover the frames 1 and 5 shown in FIG.
2, and the front and rear integrated sheet member S is placed and held on the shells 21 and 22. Here, the outer shells 21 and 22 integrally formed at the front and rear have a connecting portion 20 formed along the second shaft 11, and the connecting portion 20 has a flexible elasticity. Has been granted. Also,
The outer shells 21 and 22 formed integrally with the front and rear are formed with fitting portions 21a and 22a for fitting and receiving the front seat frame 1 and the rear seat frame 5, respectively. At the screw holes 21c and the screw holes 22b, screws are screwed into the screw holes of both the seat frames 1 and 5 with screws 21d or the like, whereby the seat frames 1 and 5 can be attached to the frames 1 and 5 on each side.

On the other hand, a backrest member B is provided on the upper half 6b of the connecting portion 6 integrated with the rear seat frame 5 and the backrest support frame 9.
It is formed separately from the sheet member S and mounted.

That is, the connecting portion 6 of the rear seat frame 5 shown in FIG.
As shown in FIG. 5, the backrest mounting frame 9, which also serves as the outer shell 23 of the backrest member B, is mounted to the screw hole 6c of the upper half 6b by a plurality of here three connection screws 23a. At the same time, a backrest member B is attached to the front surface of the frame 9, that is, the front surface of the outer shell 23, to form an example office chair Ch as shown in FIG. In addition, 24
Reference numeral 24 denotes a seat frame cover attached to the lower surface side of the front seat frame 1, reference numeral 24a denotes an insertion hole for the column P, and reference numerals 24b and 24c denote wing-shaped cover portions corresponding to the wing portions 1b and 1c of the frame 1.

Here, the connecting portion 6 between the seat frames 1 and 5 and the backrest support frame 9 and the outer shells 21 to attached to the lower surface and the back surface side of the backrest support frame 9 are provided.
The cover 23 and the cover 24 are made of, for example, a synthetic resin made of polypropylene, but may be made of a material other than the synthetic resin. Further, the shapes and structures of the outer shell and the cover are not limited to the illustrated example.

〔The invention's effect〕

In the chair Ch of the present invention described above, the side of the seat rear portion Sr of the seat member S sinks around the second shaft 11 located near the sitting position reference point Sp positioned on the seat member S. Simultaneously, the side of the backrest member B also tilts backward about the second shaft 11.

The backrest member B that tilts rearward in synchronization with the sinking of the seat rear Sr has a backrest point Bp of a seated person on its contact surface.
The backrest support frame 9 having a shallow angle and a substantially rectangular shape, or a backrest member B of the same shape, or a backrest support frame 9 and a side cross-sectional shape of the member B, and Since the backrest point Bp is constantly urged forward around the second shaft 11 by the action of the buffer member 13, regardless of the degree of inclination of the back of the person sitting on the seat member S, The backrest point Bp always acts so as to hold the waist of a person seated around the second shaft 11. The above operation is smooth and light because the number of parts is small.

Further, since the front end of the sheet front portion Sf is not displaced at all by the sinking operation or the returning operation of the sheet rear portion Sr around the second shaft 11, the seat back member B tilts the backrest member B greatly backward. Even when this is done, the back side of the knee is lifted by the upward displacement of the front end of the sheet member S, which does not cause any disadvantageous phenomena often seen in the conventional rocking mechanism.

Therefore, even if the chair of the present invention takes various postures while sitting for a long time, a load biased on the waist and buttocks is caused by a smooth sinking operation of the rear portion of the seat and a back and forth swinging operation of the backrest that moves with the seat. Since it is difficult for the wearer to wear the clothes near the waist of the seated person, it is also hard to be turned up, so that the fatigue that is easily caused by sitting on such a chair for a long time can be greatly reduced or alleviated.

[Brief description of the drawings]

FIG. 1 is a side view showing an outline of an example of the mechanism of the present invention, FIG. 2 is a plan view of the same, FIG. 3 is a perspective view showing a relationship between a front seat frame and legs of a rear seat frame connected thereto, FIG. 4 is a perspective view showing the relationship between the seat member and its outer shell, FIG. 5 is a perspective view showing the relationship between the backrest member and its mounting frame, and FIG. 6 is a view showing each of FIGS. It is a side view of an example of the office swivel chair formed with a member. 1 ... front seat frame, 2 ... bearing hole of first shaft 10, 3 ... mounting hole, 4, 7 ... bearing hole of second shaft 11, 5 ...
... Rear seat frame, 6 ... Connecting part of backrest support frame 9, 8 ... Bearing hole of third shaft 12, 9 ... Backrest support frame, 10 ... First shaft, 11 ... Second Axis (connection axis for front and rear seat frames 1 and 5), 12 ... third axis, 21-2
3 ... outer shell, S ... seat member, E ... armrest, B ... backrest member, P ... leg support, Sp ... sitting position reference point, Bp ... backrest point

 ──────────────────────────────────────────────────続 き Continuing the front page (72) Inventor Noboru Nogami 3-5-6 Minamiazabu, Minato-ku, Tokyo (72) Inventor Atsuro Egami 1-4-1-18 Imafukuhigashi, Joto-ku, Osaka-shi, Osaka Pref. Inside the workshop (56) References JP-A-63-109817 (JP, A)

Claims (3)

(57) [Claims] 1. A seat frame supporting a chair seat is divided into front and rear portions with reference to a sitting position reference point or a vicinity thereof, and a rear end portion of a front seat frame and a rear portion of a rear seat frame are divided at the divided portion. A connecting portion that connects the front side of the front end portion via a horizontal connecting shaft, and a rear end side of the rear seat frame that rises at a substantially right angle to mount a lower end side of a backrest supporting frame that supports the backrest. And formed integrally with the rear seat frame as
The front end side of the rear seat frame is formed so as to extend downward from the front seat frame side, and a buffer member such as a gas spring is erected between the extended end and the front seat frame, and A chair having a rear end portion of a front seat frame attached to a leg support on a vertical axis passing through or near the sitting position reference point. 2. The rear seat frame according to claim 1, wherein the rear seat frame is formed so as to also serve as an outer shell of a connecting portion between the frame and the backrest supporting frame. A backrest supporting frame formed also as an outer shell is connected to and integrated with a connecting portion formed integrally with a rear end of the rear seat frame;
3. The chair according to claim 1, wherein a backrest member is attached to a front surface of the integrated backrest support frame.